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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 72 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.157 + 48 =
  2. 2.144 + 28 =
  3. 3.291 + 47 =
  4. 4.31 + 59 =
  5. 5.253 + 17 =
  6. 6.463 + 59 =
  7. 7.257 + 79 =
  8. 8.271 + 28 =
  9. 9.146 + 37 =
  10. 10.65 + 27 =
  11. 11.322 + 57 =
  12. 12.97 + 67 =
  13. 13.56 + 67 =
  14. 14.465 + 57 =
  15. 15.282 + 59 =
  16. 16.263 + 77 =
  17. 17.247 + 19 =
  18. 18.192 + 59 =
  19. 19.55 + 67 =
  20. 20.313 + 28 =
  21. 21.332 + 88 =
  22. 22.161 + 78 =
  23. 23.363 + 39 =
  24. 24.109 + 68 =
  25. 25.401 + 27 =
  26. 26.471 + 58 =
  27. 27.143 + 19 =
  28. 28.330 + 38 =
  29. 29.210 + 67 =
  30. 30.428 + 97 =
  31. 31.105 + 99 =
  32. 32.258 + 79 =
  33. 33.336 + 89 =
  34. 34.292 + 97 =
  35. 35.462 + 98 =
  36. 36.309 + 48 =
  37. 37.274 + 37 =
  38. 38.209 + 39 =
  39. 39.309 + 59 =
  40. 40.91 + 79 =

Answer key

  1. 205
  2. 172
  3. 338
  4. 90
  5. 270
  6. 522
  7. 336
  8. 299
  9. 183
  10. 92
  11. 379
  12. 164
  13. 123
  14. 522
  15. 341
  16. 340
  17. 266
  18. 251
  19. 122
  20. 341
  21. 420
  22. 239
  23. 402
  24. 177
  25. 428
  26. 529
  27. 162
  28. 368
  29. 277
  30. 525
  31. 204
  32. 337
  33. 425
  34. 389
  35. 560
  36. 357
  37. 311
  38. 248
  39. 368
  40. 170

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